Electric signaling.



Nth-827,270. PATENTED ULY 31, 1906. J, B. STRUBLE. ELECTRIC SIGNALING. APPLICATION FILED MARJIZ, 1902. RENEWED JUNE 4.1904;

* wherein provision is signal at danger position under certain condi-' lines of or sections 1 2 3, 6550., by insulation inserted improperly Juices e. I

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PATEN '1 STBZ-UBLE, 9F WILKINSBURG, PENNSYLVANIA, ASSIGNUR TO SWITCH a e SlGNAL COMPANY, OF SWISSVALE PENN- A QORPGRATEON OF PENNSYLVANIA.

times are,

fipecification of Letters ?atent.

Patcnted July 21,1eoe.

Application filed March 12 1902. Renewed June 1-. 1904. Serial 1%. 211,144.

Signaling, of which the following is a specification.

y L t 1 rial No. 8.2,ee3, iiied November 16, 1901, l have descrihel and claimed certain improvements in electric signaling especially appl1- cahleto signaling for electric railways, and made for maintaining a tions in case it has a tendency to be shifted the main current from the motors of the cars. In application, Serial No. 97,861, filed March 12, 1902, l have descnhed'certain further or additional improvements in electric signal' ing for electric railways wherein alternating currents are employed in the traclocircuits and provlsionis made whereby the signal cannot be cleared by a direct current on the track-circuit due to leakage from the motorcircuit, but only by the alternating current.

The invention described in this application relates to certain further and additional improvements in a relay which may be emplcyed in such signaling system.

The invention is hereinafter more fully de-= scribed end claim d In the acc npan cg drawing is shown diagrammatically a form or embodiment of my improvement,

in the practice of my invention one of the rails is divided into a series of blocks at suitable points between the ends of adjacent rails, While the other line of rails 4- is preferably made electrically continuous in any suitable manner known in the art. One terminal of an alternating generator 5 is connected to the rail 1, While the other terminal is connected to each of the rail-soctions l 2, 850., such connection being direct through a suitable resistance 7 if necessary, as shown in the drawing, or the connections to tho soc times may he made through the medium of transformers having their secondary coils connected to the rail-sections, uhilo the pri mary coils are connected in multiple arc or g thereby alternately changing the ln-the an ilicaticnn or Letters Patent, Se-

to clear position by leakage from series with the generator, as shown in an ap plication, Serial No. 97,861, above referred to. The field coil or coils 18 of a translating device err-clay 9 are connected to the traclvrails of a block-section, so that when the clock-section is unoccupied an alternating current will flow hack and forth through the tield-coils, polarity of the poles c and d of the relay. '1 he armature 19 of the relay is surrounded by a coil 25, which is connected to a source of alternating current, preferably to the circuit of the alter nating generator 5, as shown, a suitable resistance 526 being interposed between. the generator and the coil 25, if found necessary. The coil 25 is so arranged and connected to its generator with relation to the coil or coils 18 that the poles e andf will have the same polarity as the adjacent poles c and d of the magnet 9 The coils 18 and 25 should be so connected either to the same generator or to independent generators that the phase of the alternating current or current in both coils shall be the same or in such relation that the adjacent poles c and e or d and f shall simultaneously have the same polarity. By reason of thus similarly polarizing the adjacent poles of the armature and magnet the poles of the armature Will be repelled by the poles of the magnet and the armature shifted to an angular position with its contact-arm hearing against the contact-point 23 of the auxiliary circuit 13, Wnich includes the operating or controlling mechanism of the signal 1 1.

As long as the field coil or coils 18 are excited hy an alternating current alone or by an. alternating current of greater imignetizing strength than any direct current which may llow through the coils by reason of leakage from the motor-current tho arnmluro will be hold in such position as to maintain the circuit l3 closed and the signal in clear position, [1101], however, the alternating current though the coil or coils l 8 is shun ted, the poles of the magnet become practically noutral, and tho armature will be shifted by the spring ll away from lhc stop 23 and open the circuit 13. Similarly il a direct current flows through the coil or coils l H while tho aliernat lug current is shunted or ii the direct current is stronger than the alternating current in the track-circuit, so that the attraction produced scribed herein that by it is greater, in sheet, than the repulsion produced by'the alternating current, the armature will be attracted by such poles and caused to move in a direction to open the circuit 13, such action being cumulative to the action of the spring 24:,

It is characteristic of the improvement dethe signal can be cleared and held in a clear position only by an alternating current and that a direct current flowing through the coils 18 when the alternating current is shunted or when the direct current is stronger than the alternating current will tend to open the circuit 13 and put the signal to danger position. Hence an accidental shiftingof the signal is never in a direction to cause an accident, although it may cause some delay in train movement.

What I claim as my invention is 1. In a signaling apparatus, the combination with a track-circuit, of a source of alternating currents and a relay. both included in the track-circuit, and an alternatelypolarized armature adapted to control a signal, substantially as set forth.

2. In a signal apparatus, the combination with a track-circuit, of a source of alternatternating current in t e track-circuit and the other coil from a source of alternating cur- I rent exterior to the track-rails.

4. In combination with the traclvrails ef a.-

blook-section, a source of alternating current for supplying alternating current to the track-rails, and a relay having field and er mature coils, and said field-coil being energized from the alternating traol rails.

In testimony whereof I have hereunto set my hand.

J ACOB B; STRUELE, Witnesses DARWIN S. VvoLco'rr. F. E. GAITHER.

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